Income splitting with registered accounts: what actually works in Canada

The couple earning $120k and $40k pays roughly $8,000 more tax per year than two people each earning $80k. That's the cost of Canada's progressive tax system - higher earners get hit harder, and married couples can't just split their income down the middle like they do the mortgage.

But registered accounts give you two legitimate ways around this: spousal RRSPs and pension income splitting. Both work, but the rules are pickier than most people realize.

Spousal RRSPs: lending your contribution room

A spousal RRSP lets the higher earner contribute to an RRSP in the lower earner's name. The contributor gets the tax deduction now - at their higher marginal rate - but the withdrawals later get taxed in the spouse's hands at their (presumably) lower rate.

Say you're earning $100k and your partner earns $45k. In Ontario, your marginal rate is about 43%, theirs is about 29%. You contribute $10,000 to a spousal RRSP - you get the deduction at 43%, but when they withdraw it in retirement, it gets taxed at whatever rate applies to them then.

The catch: the three-year rule. If your spouse withdraws money from their spousal RRSP within three years of your last contribution, that withdrawal gets attributed back to you for tax purposes. The higher earner pays the tax, which defeats the point entirely.

This isn't three years from each individual contribution - it's three years from your most recent one. Contribute $5,000 this year and $2,000 next year? Your spouse needs to wait until 2030 before touching any of it.

Pension income splitting: the retirement version

Once you're 65, you can split up to 50% of eligible pension income with your spouse. This includes RRIF withdrawals, life annuity payments, and employer pension income. At $80k in Ontario, your marginal rate is about 31.5% - but split that income and you're both at roughly 28.2%.

The TaxSplit.ca calculator will show you exactly how much this saves for your household income and province, but the difference adds up quickly. A retired couple with $100k in RRIF income might save $2,500 annually just by filing the election.

TFSA withdrawals don't count - they're already tax-free. Neither do CPP or OAS payments, though you can split CPP through a separate application process.

What doesn't work

You can't contribute to your spouse's TFSA using your contribution room. Each person's TFSA room is their own - no sharing, no borrowing, no spousal version. You can give your spouse cash to contribute to their TFSA, but it has to come from their room.

Same with the FHSA. No spousal version exists, though both spouses can have their own accounts for the same home purchase.

Regular investment income splitting through loans or gifts gets complicated fast and often doesn't survive CRA scrutiny. The attribution rules are designed to prevent exactly this kind of planning.

The long game

The spousal RRSP works best when you expect a significant income gap in retirement. If you're both planning to have similar retirement incomes - maybe you're both professionals with decent pensions - the benefit shrinks.

But if one spouse plans to retire early or has limited pension savings, the spousal RRSP can save thousands in tax over the long term. Just remember that three-year rule. Start early, contribute consistently, and don't treat it like emergency money.

The 2025 RRSP contribution limit is $32,490 - you can split that between your own RRSP and your spouse's spousal RRSP however makes sense. Your total contribution room doesn't change, but where the tax gets paid later does.